Ruby'；s Time.strftime%P选项不'；不行？

我正在构建一个rails应用程序，遇到了一个看似奇怪的行为。根据，%P和%P是有效选项：

%p - Meridian indicator (``AM''  or  ``PM'')
%P - Meridian indicator (``am''  or  ``pm'')

使用rails控制台（rails 3.0.3、ruby 1.8.7（2009-06-12 patchlevel 174）[universal-darwin10.0]），我观察到以下行为：

>> DateTime.now.strftime("%l:%M%P on %A %e %Y")
=> " 2:23pm on Tuesday  1 2011"
>> Time.now.strftime("%l:%M%P on %A %e %Y")
=> " 2:23P on Tuesday  1 2011"
>> Time.now.strftime("%l:%M%p on %A %e %Y")
=> " 2:23PM on Tuesday  1 2011"
>> 2.hours.ago.strftime("%l:%M%P on %A %e %Y")
=> "11:29P on Monday 28 2011"

请注意，在DateTime.now.strftime中，%p如何计算为预期的小写pm。With Time.now.strftime%P以大写形式呈现

最后一个示例使用ActiveSupport:：TimeWithZone类，该类的渲染也不正确（2小时前是早上）

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这是预期的行为吗？或者我应该在某个地方提交一个bug，如果是的话，最好的地方是哪里？

irb中的1.9.2-p180：

Welcome to IRB. You are using ruby 1.9.2p180 (2011-02-18 revision 30909) [x86_64-darwin10.6.0]. Have fun ;)
>> Time.now.strftime('%p %P') #=> "PM pm"
>> DateTime.now.strftime('%p %P') #=> "PM pm"

irb中的1.8.7：

Welcome to IRB. You are using ruby 1.8.7 (2011-02-18 patchlevel 334) [x86_64-darwin10.6.0]. Have fun ;)
>> Time.now.strftime('%p %P') #=> "PM P"
>> DateTime.now.strftime('%p %P') #=> "PM pm"

未显示对1.8.7的“%p”支持：

Format meaning: %a - The abbreviated weekday name (``Sun'') %A - The full weekday name (``Sunday'') %b - The abbreviated month name (``Jan'') %B - The full month name (``January'') %c - The preferred local date and time representation %d - Day of the month (01..31) %H - Hour of the day, 24-hour clock (00..23) %I - Hour of the day, 12-hour clock (01..12) %j - Day of the year (001..366) %m - Month of the year (01..12) %M - Minute of the hour (00..59) %p - Meridian indicator (``AM'' or ``PM'') %S - Second of the minute (00..60) %U - Week number of the current year, starting with the first Sunday as the first day of the first week (00..53) %W - Week number of the current year, starting with the first Monday as the first day of the first week (00..53) %w - Day of the week (Sunday is 0, 0..6) %x - Preferred representation for the date alone, no time %X - Preferred representation for the time alone, no date %y - Year without a century (00..99) %Y - Year with century %Z - Time zone name %% - Literal ``%'' character t = Time.now t.strftime("Printed on %m/%d/%Y") #=> "Printed on 04/09/2003" t.strftime("at %I:%M%p") #=> "at 08:56AM"

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它已经在ruby-1.9.1-p378Cheers中修复，应该检查一下！谢谢：）@Nick，您可以在Time.strftime之后使用

sub

强制执行所需的大小写：

Time.now.strftime（“%H:%M:%S%p”）.sub（/（AM | PM）/）{M | M.downcase}#=>“19:04:52 PM”

ri ActiveSupport::TimeWithZone#strftime ----------------------------------- ActiveSupport::TimeWithZone#strftime strftime(format) ------------------------------------------------------------------------ Replaces +%Z+ and +%z+ directives with +zone+ and +formatted_offset+, respectively, before passing to Time#strftime, so that zone information is correct